The Census reported that 12,573 people (50.7% of the population) lived in households, 116 (0.5%) lived in non-institutionalized group quarters, and 12,124 (48.9%) were institutionalized.

There were 3,594 households, out of which 1,981 (55.1%) had children under the age of 18 living in them, 1,737 (48.3%) were opposite-sex married couples living together, 781 (21.7%) had a female householder with no husband present, 376 (10.5%) had a male householder with no wife present. There were 384 (10.7%) unmarried opposite-sex partnerships, and 19 (0.5%) same-sex married couples or partnerships. 556 households (15.5%) were made up of individuals and 214 (6.0%) had someone living alone who was 65 years of age or older. The average household size was 3.50. There were 2,894 families (80.5% of all households); the average family size was 3.84.

The population was spread out with 4,434 people (17.9%) under the age of 18, 2,695 people (10.9%) aged 18 to 24, 10,203 people (41.1%) aged 25 to 44, 6,163 people (24.8%) aged 45 to 64, and 1,318 people (5.3%) who were 65 years of age or older. The median age was 35.0 years. For every 100 females there were 294.8 males. For every 100 females age 18 and over, there were 398.0 males.

There were 3,958 housing units at an average density of 530.1 per square mile (204.7/km²), of which 1,851 (51.5%) were owner-occupied, and 1,743 (48.5%) were occupied by renters. The homeowner vacancy rate was 1.7%; the rental vacancy rate was 11.8%. 6,607 people (26.6% of the population) lived in owner-occupied housing units and 5,966 people (24.0%) lived in rental housing units.

As of the census[13] of 2000, there were 14,458 people, 2,769 households, and 2,229 families residing in the city. The population density was 2,260.2 people per square mile (872.2/km²). There were 3,016 housing units at an average density of 471.5 per square mile (182.0/km²). The racial makeup of the city was 34.1% White, 14.2% Black or African American, 1.4% Native American, 0.7% Asian, 0.1% Pacific Islander, 46.4% from other races, and 3.1% from two or more races. 59.6% of the population were Hispanic or Latino of any race.

There were 2,769 households out of which 49.7% had children under the age of 18 living with them, 54.5% were married couples living together, 17.9% had a female householder with no husband present, and 19.5% were non-families. 16.0% of all households were made up of individuals and 6.3% had someone living alone who was 65 years of age or older. The average household size was 3.44 and the average family size was 3.83.

In the city, the population was spread out with 24.4% under the age of 18, 13.0% from 18 to 24, 42.0% from 25 to 44, 15.3% from 45 to 64, and 5.4% who were 65 years of age or older. The median age was 31 years. For every 100 females there were 207.8 males. For every 100 females age 18 and over, there were 264.9 males. However, the statistics relating to the disparity between the male and female population in Corcoran is due to the prison's male only population.

At the time of the 2000 census, the median income for a household in the city was $30,783, and the median income for a family was $32,852. Males had a median income of $30,787 versus $21,792 for females. The per capita income for the city was only $13,458. It is noteworthy that about 23.4% of families and 26.9% of the population were below the poverty line, including 36.4% of those under age 18 and 10.6% of those age 65 or over.

Many local residents are employed in agriculture. However, the community has been affected by the Great Recession as well as the decline of the cotton industry, the California drought and restrictions on pumping from the Sacramento River delta to protect endangered species. In November 2016, the unemployment rate was 11.1%.[14]

Corcoran was founded by Hobart Johnstone Whitley, a prominent land developer from southern California, who took the lead in building Corcoran (the main street of the community is named in his honor). Liking what he saw during a visit to the area in 1905 (a blacksmith shop, small store, scattered homes and a lush, untapped vista with herds of grazing wild hogs, horses and steers) Whitley purchased 32,000 acres (130 km2) to start development. Much like in the San Fernando Valley (Van Nuys and Canoga Park his "creations"), Whitley "leveraged" his holdings with the support of important Los Angeles businessmen. Whitley first intended the town be named "Otis", after Harrison Gray Otis of the Los Angeles Times, and streets as Otis, Sherman, Letts (the Broadway store) and Ross (after his son, Ross Whitley) show the connections. Whitley, it is claimed, purchased and platted some 150 towns over the American West—and Corcoran is one of his last.

Whitley moved a member of his real estate firm, J. W. Guiberson, to the area. Guiberson became one of the many pioneers of the community, building the first home and business structure in Corcoran. His family also helped establish the first church in the community, an event which helped lead to the town’s incorporation on August 14, 1914.

The basis of Corcoran’s economy then and now is agriculture. Initially, the most successful crops were grains, alfalfa and sugar beets.